• 作者： 田堯彰; 鄭蔚民
• 作者服務機構： 國立台灣大學土木工程學系
• 中文摘要： 根據振態掃除觀念與帶寬過濾過程，本文提出一種新的方法以利用在結構物上量測到的地震記錄去識別一個線性且非時變的結構系統之振態參數。識別乃經由選取模型的振態參數以使某一頻率內的過濾加速度反應與預測的模型反應間有最小的乘方差。此過程可在時間域或頻率域為之。此外，視初始條件為欲識別的參數且考慮暫態反應的效應。由於過濾的作用，振態掃除相當有效。估計參數值的迅速收斂使起始參數值的選取可為任意的。最後引用前人研究過的例子來闡述本法確具有相當高的準確性。
• 英文摘要： A new algorithm, based on the modal sweep concept and a band-pass filtering process, is developed toidentify the modal parameters of a linear, time-invariant model of a structure from its recorded earthquakeresponse. The identification is performed by selecting modal parameters to obtain a least squaresfit between the filtered acceleration response over a specified frequency band and the predicted modeloutput The identification can be carried out either in the time domain or in the frequency domain. Theinitial conditions are deemed as parameters and the transient effects are taken into account. Attributed tothe filtering effect,the modal sweeps are very effective. The rapid convergence of estimated parametervalues makes an arbitrary selection of initial parameter values possible. The high degree of accuracy whichthe method is capable of is demonstrated by means of two typical examples previously investigated byother researchers.
• 中文關鍵字： system identification; earchquake engineering; modal sweeping
• 英文關鍵字： --